<div class="select_value">
    <fieldset >
        <legend>
            <b>Площадь</b>
        </legend>

        <p>
            дом от
            <input maxlength="4" size="5" value="<?php if(isset($minarea)){  if($minarea != '' && $minarea != '0')
            { echo $minarea;  }} ?>" name="minarea"  
            
            onkeyup="return check_number(this);" onchange="return check_number(this);">
            до
            <input  maxlength="4" size="5" value="<?php if(isset($maxarea)){  if($maxarea != '' && $maxarea != '0'){ echo $maxarea;  }} ?>"  name="maxarea"  onkeyup="return check_number(this);" onchange="return check_number(this);">
            м<sup>2</sup>

        </p>
        <p>
            участок от
            <input  maxlength="5"  size="5"  value="<?php if(isset($minsite)){  if($minsite != '' && $minsite != '0'){ echo $minsite;  }} ?>"  name="minsite"  onkeyup="return check_number(this);" onchange="return check_number(this);">
            до
            <input  maxlength="5"  size="5"  value="<?php if(isset($maxsite)){  if($maxsite != '' && $maxsite != '0'){ echo $maxsite;  }} ?>" name="maxsite" onkeyup="return check_number(this);" onchange="return check_number(this);">
            соток

        </p>

    </fieldset>
</div>